Luft Terms of Use

These terms govern the use of the Luft desktop application, published by Alberto Quintin Navarro (“the author”). By installing or using Luft you accept these terms. If you do not accept them, do not use the application.

1. Free use

Luft is provided free of charge. There is no purchase, subscription or user account. The author grants you a non-exclusive licence to install and run the application for lawful personal or professional purposes, including commercial ones, on as many computers as you use yourself.

2. Closed source

Luft is closed-source software and the author retains the rights to its code and distribution. This licence does not allow you to sell, rent, lend, sublicense, redistribute or modify the application, or to decompile or reverse-engineer it, except to the extent expressly permitted by applicable law. You may link to this site so others can download Luft from its official source.

3. Third-party components

Luft includes components created by third parties, each subject to its own licence. Their notices and licence texts are available under Help → About and in the installation folder. Nothing in these terms limits the rights granted by those licences.

4. Chess engines

Luft can run UCI engines but distributes none. Any engines you install are independent programs subject to their respective authors’ terms. Luft does not control or accept responsibility for their operation, results or possible network connections.

5. Your files

The games, databases, repertoires, annotations and settings you create or import are yours. Luft stores them on your computer and does not send them to the author. You are responsible for keeping backups. Luft’s own network connections are described in the privacy policy.

6. Reference database

The downloadable reference database is a work separate from the application. It comes from the official Lichess broadcasts, licensed under CC BY-SA 4.0. It has been deduplicated and converted from PGN to .luftdb without altering the contents of the games, and is redistributed under the same licence.

If you share or adapt that database, you must credit Lichess.org, link to the source and licence, indicate your changes and distribute the adaptation under CC BY-SA 4.0 or a compatible licence. These obligations apply to the reference database, not to databases and repertoires you create yourself.

7. Updates

Luft may check whether a newer version exists. The application informs you before downloading or installing it and waits for your confirmation. Each version is governed by the terms accompanying it; if they change materially, the new version must make them available before you decide to install or use it.

8. No voluntary warranty

Luft is provided free of charge “as is”, without voluntary warranties that it will be defect-free or continuously available, or that its analysis, statistics or data will be accurate. Keeping backups is recommended. This clause does not limit any rights or guarantees that applicable law mandatorily grants you.

9. Liability

To the maximum extent permitted by law, the author is not liable for indirect damage, loss of profit, loss of work or loss of data arising from the use of or inability to use Luft. Nothing in these terms excludes or limits liability that cannot legally be excluded or limited, including liability arising from wilful misconduct, gross negligence or personal injury where applicable.

10. Term

You may stop exercising these rights at any time by uninstalling Luft. The licence to use Luft ends if you materially breach these terms; this does not affect rights granted to you over third-party components by their own licences.

11. Governing law and contact

These terms are governed by Spanish law. Where the user is a consumer, jurisdiction lies with the bodies determined by mandatory consumer-protection law. For any enquiry, write to [email protected]. If the Spanish and English versions differ, the Spanish version prevails.